What core xp1800 you talking about ?
Is it a palomino or thorobred? If its a tbred you only need to connect 1 L3 bridge on top the chip. If its a palomino, then all the L1 bridges need to be jumped(not easy) see thg video on it. If you buy a motherboard like the Epox 8rda, it automaticly unlocks the multipliers on the tbred core xps. If you dont know what any of this means,then maybe you should learn a little more before you try to overclock anything.
system spec or witty quote , still thinking.....